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regulator: max77686: fix gpio_enabled shift wrapping bug 

The code should handle more than 32 bits here because "id"
can be a value up to MAX77686_REGULATORS (currently 34).

Convert the gpio_enabled type to DECLARE_BITMAP and use
test_bit/set_bit.

Fixes: 3307e9025d ("regulator: max77686: Add GPIO control")
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Joe Perches <joe@perches.com>
Reviewed-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Cc: stable@vger.kernel.org
This commit is contained in:
Joe Perches 2015-05-18 10:01:03 -07:00 committed by Mark Brown
parent e4e8ccccf3
commit c53403a37c
1 changed files with 3 additions and 3 deletions
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6
drivers/regulator/max77686.c
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@ -88,7 +88,7 @@ enum max77686_ramp_rate {
};
struct max77686_data {
u64 gpio_enabled:MAX77686_REGULATORS;
DECLARE_BITMAP(gpio_enabled, MAX77686_REGULATORS);
/* Array indexed by regulator id */
unsigned int opmode[MAX77686_REGULATORS];
@ -121,7 +121,7 @@ static unsigned int max77686_map_normal_mode(struct max77686_data *max77686,
case MAX77686_BUCK8:
case MAX77686_BUCK9:
case MAX77686_LDO20 ... MAX77686_LDO22:
if (max77686->gpio_enabled & (1 << id))
if (test_bit(id, max77686->gpio_enabled))
return MAX77686_GPIO_CONTROL;
}
@ -277,7 +277,7 @@ static int max77686_of_parse_cb(struct device_node *np,
}
if (gpio_is_valid(config->ena_gpio)) {
max77686->gpio_enabled |= (1 << desc->id);
set_bit(desc->id, max77686->gpio_enabled);
return regmap_update_bits(config->regmap, desc->enable_reg,
desc->enable_mask,